the advantages of DOL starter:-This is a protection device.
When motor takes large current from supply, then trip to
suplly.& safe from burn out.
When single phasing occures in the system then become
trip to sypply.by O.L.c.(over load coil).
main advantages of dol starter are
1.cost is less(star delta starter contains 3 contactors,a timer dol
contains a contactor only).
2.protection(it contains over current protection devices.star delta
starter also contains this)
3.less space is required
but it is used only for small motors like power less than 7.5,10Hp
For these 2 devices what their power ratings are ?
1) single phase : AC 220V & starting amps 3Amps (i.e.
starting torque) and the stabilized amps 2A ... For deep
2) single phase : AC 220V & starting amps 2.7Amps (i.e.
including the starting torque of a CRT monitor) and the
stabilized amps 1 Amps